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ADX cluster 1 zone

Sereena Kurunkadan 0 Reputation points
2025-07-18T12:53:22.9866667+00:00

We currently have an Azure Data Explorer (ADX) cluster configured to run across Availability Zones 1, 2, and 3. The cluster is marked as Zonal, and under the cluster settings, it shows:

Availability zones: 1, 2, 3

Zones status: Zonal

Since this is a production environment and not a dev/test setup , I understand the potential availability risks associated with limiting it to a single zone. However, reducing monthly costs has become a priority.

Given that zonal deployment likely incurs additional charges due to replication of compute (VMs) and storage across multiple zones, I’d like to know:

Is it possible to reconfigure the existing ADX cluster to use only a single availability zone to help reduce ongoing costs?

Azure Data Explorer
Azure Data Explorer
An Azure data analytics service for real-time analysis on large volumes of data streaming from sources including applications, websites, and internet of things devices.

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  1. Smaran Thoomu 28,310 Reputation points Microsoft External Staff Moderator
    2025-07-18T14:39:59.74+00:00

    Hi Sereena Kurunkadan

    Thanks for your question.

    Currently, once an Azure Data Explorer (ADX) cluster is deployed as zonal across multiple availability zones, it cannot be changed to a single-zone setup. This is by design, as the zone configuration is fixed at creation time.

    User's image

    If reducing cost is a priority, the only way to move to a single availability zone is to create a new ADX cluster in a single zone and migrate your data and queries to that new cluster.

    For more information, please refer this: https://learn.microsoft.com/en-us/azure/data-explorer/migrate-cluster-to-multiple-availability-zone?tabs=az-azure-portal%2Cconfig-rest-api

    I hope this information helps. Please do let us know if you have any further queries.

    If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

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  2. Sander van de Velde | MVP 36,941 Reputation points MVP Volunteer Moderator
    2025-07-22T14:43:14.7933333+00:00

    Hello @Sereena Kurunkadan ,

    welcome to this moderated Azure community forum.

    As seen in the other post, Azure Data Explorer offers no backup feature by default.

    So, you need to lift and shift the data from one to database to another.

    My friend Wilko wrote this blog post on making a backup and restoring data in Azure Data Explorer.

    I hope this helps you migrating the data.

    If the response helped, do "Accept Answer". If it doesn't work, please let us know the progress. All community members with similar issues will benefit by doing so. Your contribution is highly appreciated.

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